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Share Based Compensation (Details) (USD $) In Millions, except Share data	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2010
Performance Unit Plan [Abstract]
Performance units granted		15,655
Accelerated compensation costs from amendment	$ 0.5
Compensation expense		0.8	0.4
Cash payments for prior activity		0.5
Vested awards	$ 2.2	$ 2.2

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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